Phase transformation of methane hydrate under high pressure

• Published in: The Journal of Chemical Physics
• Main Authors: Sun, Q, Duan, TY, Zheng, HF, Ji, JQ, Wu, XY
• Other Authors: Sun, Q (reprint author), Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China., Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China., Chinese Acad Sci, Inst Geophys, Beijing 100029, Peoples R China.
• Format: Journal/Newspaper
• Language: English
• Published: journal of chemical physics 2005
• Subjects: RAMAN-SPECTROSCOPY; GPA; Methane hydrate
• Online Access: https://hdl.handle.net/20.500.11897/155311; https://doi.org/10.1063/1.1830411

In situ Raman spectroscopy is employed to study the phase behavior of methane hydrate at high pressure. The structure 1 of methane hydrate can be maintained up to 950 MPa at 299 K. The transformation of structure I< --- >structure H+water+CH4 occurs at 880 MPa and 323 K. The structure H of methane hydrate, however, decomposes to methane and water at 960 MPa and 348 K. The initiation mechanism of methane hydrate sI is also discussed. (C) 2005 American Institute of Physics. Physics, Atomic, Molecular & Chemical SCI(E) EI PubMed 4 ARTICLE 2 024714 122